Adjustable reversing attachment and feed for cutting-tools.



J. H. GEBHARDT.

ADJUSTABLE REVERSING ATTACHMENT AND FEED FOR CUTTING TOOLS.

APPLICATION FILED NOV. 1, 1909,

9?} 262,, Patented Sept. 27, 1910.

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J. H. GEBHARDT.

ADJUSTABLE REVERSING ATTACHMENT AND FEED FOR GUTTING TOOLS.

APPLICATION FILED NOV. 1, 1909.

Patented Sept. 27, 1910.

3 SHEETSSHEET 2.

d -flin 2% am; WWW- m. 73mg J. H. GEBHARDT.

ADJUSTABLE REVERSING ATTACHMENT AND FEED FOR CUTTING TOOLS.

. APPLICATION FILED NOV. 1, 1909.

Patented Sept. 27, 1910.

3 SHEETS-SHEET 3.

employ; Fig. VIII shows a sectional view other, are two bevel gear wheels, 14 and 15 JOHN H. GEBHARD'I, OF DES MOINES, IOWA.

ADJUSTABLE REVERSING ATTACHMENT AND FEED FOR CUTTING-'I'QOLS.

Specification of Letters Patent.

Patented Sept. 27, 1913.

Application filed November 1, 1909. Serial No. 525,773.

To all whom it may concern:

Be it known that I, JOHN H. GEBHARDT, a citizen of the United States, residing in Des Moines, county of Folk, and State of Iowa, have invented a new and useful Improvement in Adjustable Reversing Attachments and Feeds for Cutting-Tools, of which the following is a specification.

This invention relates to that class of lathes which are adapted for cutting and drilling machinery, and the like, wherein a vertical lathe shaft is employed, and has for its purpose the construction of a machine wherein the direction of movement of the shaft may be speedily reversed and at the same time the shaft be accurately and uniformly fed downward.

As the form of lathe, and the machine in general, is of the ordinary type the construction of the same will not be described, except as it may enter into, and be essential to, the operation of the improvements which I have placed thereon.

My invention consists of certain details of construction hereinafter set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which Figure I shows a side elevation view of a portion of a lathe fitted out with my improvements; Fig. II shows another side elevation view of the same; Fig. III shows a plan view of the same; Fig. IV shows a sectional view taken on the line 4l4, in Fig. I; Fig. V shows a sectional view taken on the line 55, in Fig. II Fig. VI shows a sectional View taken on the line 6-6, in Fig. I; Fig. VII shows an enlarged detail view, in plan, of the gearing and levers T taken on the line 8-8, in Fig. VII; Fig. TX shows a detail view of a portion of the carriage frame, and the adjustable clamp thereon, which I employ; and Fig. X shows a detail View of the ratchet feed I employ.

Referring to the accompanying drawings the reference numeral 10 is used to indicate the frame of a vertical lathe, andthe numeral 11 indicates a U shaped track on which the gear carriage 12 is designed to be mounted for horizontal movement.

The numeral 13 indicates the power shaft, driven as shown, and mounted thereon, as idlers but in permanent relation to each respectively, their toothed surfaces facing each other.

The numeral 16 indicates a stub shaft, secured in the gear carriage 12, having mounted on its forward end a two faced bevel gear wheel 17, the forward face thereof being in permanent engagement with, and meshing with, each of the gear wheels 14 and 15, and its rear face being in permanent engagement with, and meshing with, a bevel gear wheel 18 secured to the upper eX- treniity of a square stub shaft 20 which telescopes into a square channel in the upper extremity of the lathe shaft 21.

The numeral 22 indicates a rack, secured to the upper extremity of the lathe shaft, which meshes with, and is operated by, a gear wheel 23 secured to a shaft 24 mounted in the gear carriage 12, the said shaft being also provided with a drive wheel 25, operated in a manner which will be hereinafter explained.

The numeral 26 indicates a clutch, secured on the power shaft 13 between the gear wheels 14 and 15, and is designed to throw either of said wheels into gear, according to its respective engagement. The said gear wheels, as hereinbefore stated, are idlers until one or the other is thrown into gear, and the clutch rotates, at all times, with the power shaft. The clutch is maintained in its position, and moved laterally, by the arm 27 which is permanently secured to the sliding lever 28, said lever being mounted, for sliclable movement, in bearings 29 and 30 secured on the gear carriage 12. To the other end of the lever 28 is loosely secured a for- Wardly projecting lever 31, fulcrumed in the gear carriage as shown at 32, and the movement of lever 31 causes the lever 28 to slide backward or forward, as the case may be. When the lever 28 moves forward it causes the clutch to throw gear wheel 15 into gear, and when it moves backward it releases gear wheel 15 and throws gear wheel 14 into gear. It is obvious that reverse motion is in'iparted to gear wheel 17, and its connections, by these operations.

Mounted in the forward part of the gear carriage 12 is a vertical shaft 33, provided, at its base, with a worm gear 3st, and the construction of my machine is such that the worm gear meshes with, and operates, the gear wheel 25. It is obvious that this move ment operates the rack 22. To the shaft 33 is mounted a loosely swinging arm 35, which is provided with a spring actuated, downwardly projecting, lever or rod 36, and this lever is designed to engage and operate, a ratchet wheel 37, which is rigidly secured to the shaft 33. This construction is clearly shown in Figs. VI and X. Thus the movement, in one direction, of the arm 35 will cause the shaft 33 to slightly revolve, while the reverse movement of the said arm will not move the shaft but permit the ratchet arm to move back another notch, or more, on the ratchet wheel. The arm 35 is operated when the lever 31 is operated, as I have permanently secured the two together by the loosely connected arm 38, and thus the movement of the two is simultaneous and uniform.

The numeral 39 indicates a disk, circular in conformation, adjustably secured to the lathe shaft 21 and provided, near its periphery, with a continuous row of orifices by means of which the lug 4:0 and the outwardly projecting arm 41 are adjustably secured thereto. The arm &1 extends outwardly from said disk at a tangent to the periphery thereof.

The numeral 42 indicates a vertical rod extending, from a loose connection near the base of the frame, to a loose connection with a lever 43 which is fulcrumed in a carriage 4-1 slidably secured to the U shaped track 11, said lever t3 resting, normally, in a vertical position, its upper end being U shaped to receive the body of the lever 31. The mounting of the rod 42 is such that it assumes a position immediately outside of the disk 39 where, when the disk revolves, it can be grasped by the arm 41 and pulled inwardly and when the motion of the disk is reversed it will be engaged by the lug L0 and deflected outwardly. This rod, or lever, 12 may be incased by a tube to operate as a roller, if desired.

My device is adapted, mainly, for cutting lathes where the object to be trimmed, reamed, or otherwise cut, is circular in conformation, and it operates as follows: The object is secured by any ordinary means, one of which I have illustrated in Fig. V, to the lathe shaft 21 and the circular disk 39 secured on the shaft at any desired pointabove it. The power is then turned on and transmits a rotary motion to the power shaft 13 and, assuming the clutch is now holding the gear wheel let in gear, the cut ting tool, which I have shown but not designated by a numeral, is operating on the object and, obviously, the disk 39 is rotating with the shaft. When the lug 40 comes in contact with the rod 42 the said rod is outwardly deflected thus throwing the upper extremity of the lever at?) inwardly and this movement causes the sliding lever 28 to move outwardly thus causing the clutch to engage the gear wheel 15 and throw it into gear, at the same time throwing the gear movement of the power shaft and the object moves backward the cutting tool traveling in the space it has cut during the forward movement of the shaft. The shaft continues to move rearwardly until the arm e1 engages the rod 42 and pulls it inwardly. This causes the upper extremity of the lever a3 to move outwardly thus moving the sliding lever 28 inwardly and the clutch releases the gear wheel 15 and engages, and throws into gear, the gear wheel 1st. It is obvious that this again reverses the direction of move ment of the power shaft, and causes it to move forward. Each time the lever 43 moves the arm 35 also moves, either outward or inward, and when the said arm moves outward, which occurs immediately before the gear wheel 1% is thrown into gear, it causes the ratchet wheel 37 to slightly re volve and this, in turn, slightly lowers the power shaft 21, thus providing a fresh and uncut surface on the object on which the cutting tool may operate during the forward movement of the power shaft. hen the object moves backward, the cutting tool travels on dead ground, the arm 35 moves the pin 36 rearwardly into engagement with other teeth on the gear wheel 37 and thus provides for further downward feed of the power shaft when the next reverse movement thereof is accomplished. It is obvious that the worm gear, operating on the gear wheel 25, provides the feed referred to.

Having thus described my invention what I claim and desire to secure by Letters Patent of the United States, is:

1. A lathe for cutting tools comprising, in combination, a vertical lathe shaft mounted for rotary movement and for a limited upward and downward movement; a rack on said shaft to control its upward and clownward movement; gearing to operate said rack, being itself operated by a combination of levers; a circular disk on said shaft; a lug on said disk; an arm on said disk; means whereby the arm and lug on the disk will, during the revolution of the shaft, operate the combination of levers which control the movement of the rack; and means to reverse the rotary movement of the lathe shaft each time the lug or arm operate the aforesaid combination of levers, substantially as shown and described.

2. A lathe for cutting tools comprising in combination a vertical lathe shaft mounted for rotary movement and for a limited upward and downward movement and means to drive said shaft; a circular disk on said shaft; an arm on said disk; a lug on said disk; a vertical rod extending from the lower frame of the lathe to a point near the upper frame thereof, said rod being in the line of movement of the lug and arm; a lever fulcrumed in the upper frame of the lathe, its

wheel 14: out of gear. This reverses the lower end being loosely connected to the aforesaid vertical rod; and means whereby the moving of said lever in one direction will throw into gear a gear wheel which moves the lathe shaft in one direction and when said lever is moved in the opposite direction it will throw into gear a gear Wheel which will move the lathe shaft in a reverse direction, substantially as shown and described.

3. A lathe for cutting tools comprising in combination, with a vertical lathe shaft pro vided with means for reversing the movement thereof, a lathe shaft mounted for a limited upward and downward movement; a rack on said shaft; a gear wheel, secured to a shaft mounted in the frame of the lathe, adapted to operate said rack; a second gear wheel on said shaft; a stub shaft secured in the upper frame work; a worm gear on said stub shaft, designed to engage and operate the said second gear wheel; a ratchet wheel on said stub shaft; a spring actuated ratchet lever secured in a ratchet arm loosely mounted on said stub shaft; and means, connected with the reversing means for the lathe shaft, for moving said ratchet arm forward or backward with each reversal of movement of the lathe shaft, substantially as shown and described.

JOHN H. GEBHARDT. Witnesses:

ELIZABETH 0. Ron, ZELL G. Ron. 

